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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2020
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | Note 19—Goodwill and Other Intangible Assets ​ The carrying amount of goodwill was $1.6 billion at September 30, 2020, compared to $1.0 billion at December 31, 2019 and September 30, 2019. The Company added $563.6 million in goodwill related to the CSFL merger in 2020. The Company’s other intangible assets, consisting of core deposit intangibles, noncompete intangibles, and client list intangibles are included on the face of the balance sheet. The Company added $125.9 million in core deposit intangible and $10.0 million in client list intangibles related to the CSFL merger in 2020. ​ The Company completed its annual valuation of the carrying value of its goodwill as of April 30, 2020. We determined that no impairment charge was necessary at this time. We will continue to monitor the impact of COVID-19 on the Company’ business, operating results, cash flows and/or financial condition. ​ Our other intangible assets, consisting of core deposit intangibles, noncompete intangibles, and client list intangibles are included on the face of the balance sheet. The following is a summary of gross carrying amounts and accumulated amortization of other intangible assets: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31, | ​ | September 30, | ​
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2019 |
Gross carrying amount | ​ | $ | 258,162 | ​ | $ | 119,501 | ​ | $ | 119,501 | ​
Accumulated amortization | ​ |  | (86,525) | ​ |  | (69,685) | ​ |  | (66,418) | ​
​ | ​ | $ | 171,637 | ​ | $ | 49,816 | ​ | $ | 53,083 | ​
​ Amortization expense totaled $9.6 million and $17.2 million, for the three and nine months ended September 30, 2020, respectively, compared to $3.3 million and $9.8 million, for the three and nine months ended September 30, 2019, respectively. Other intangibles are amortized using either the straight-line method or an accelerated basis over their estimated useful lives, with lives generally between two and 15 years. Estimated amortization expense for other intangibles for each of the next five quarters is as follows: ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | ​ | ​ | ​
Quarter ending: |  | ​ |  |
December 31,2020 | ​ | $ | 9,437 | ​
March 31,2021 | ​ |  | 8,831 | ​
June 30,2021 | ​ |  | 8,613 | ​
September 30,2021 | ​ |  | 8,201 | ​
December 31,2021 | ​ | ​ | 8,200 | ​
Thereafter | ​ |  | 128,355 | ​
​ | ​ | $ | 171,637 | ​
​

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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